Density of an apple.

Hi,

This is my first post could someone please help me solve this and show me how you come to the answer?

A net of 6 apples from Asda has a total mass of 1590g, measured to the nearest 10s, and the volume of one apple is 3.0 x 10to the power of -4cubed. Calculate the density of an apple. Give your answer in scientific notation and to the appropriate number of significant figures.